28250305578 has 32 divisors (see below), whose sum is σ = 68485590720. Its totient is φ = 8560698480.

The previous prime is 28250305561. The next prime is 28250305583. The reversal of 28250305578 is 87550305282.

28250305578 is a `hidden beast` number, since 28 + 2 + 50 + 3 + 0 + 5 + 578 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23779125 + ... + 23780312.

It is an arithmetic number, because the mean of its divisors is an integer number (2140174710).

Almost surely, 2^28250305578 is an apocalyptic number.

28250305578 is an abundant number, since it is smaller than the sum of its proper divisors (40235285142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28250305578 is a wasteful number, since it uses less digits than its factorization.

28250305578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47559459 (or 47559453 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 45.

The spelling of 28250305578 in words is "twenty-eight billion, two hundred fifty million, three hundred five thousand, five hundred seventy-eight".